Iwatsu SS-623S Instruction Manual page 27

Chapter 4 Measurement
4.3.2 Withstand Voltage Guarantee Range of Rogowski Coil
Sensor
The withstand voltage guarantee range of the Rogowski Coil Sensor is
illustrated in Figure 4.4. The sensor cable's withstand voltage guarantee
range is the section covered with a gray tube (approx. 500 mm). Keep the
section of the sensor cable where the withstand voltage is not guaranteed
away from high-voltage parts.
Withstand voltage guarantee range
Unit: mm
Figure 4.4 Withstand Voltage Guarantee Range
4.3.3 To Minimize Influence of Fluctuations in Voltage
If there is a part whose voltage fluctuates around the Rogowski Coil Sensor,
electrostatic coupling between the part and the Rogowski Coil will occur.
This may influence the output from this instrument.
If possible, place the Rogowski Coil Sensor away from the part whose
voltage fluctuates. This will improve noise caused by electrostatic coupling.
For instance, it is improved to measure the electric current that flows to IGBT
in the emitter terminal connected with not the collector terminal that changes
greatly the voltage but a constant voltage and is improved the capacitive
coupling noise.
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